DLASQ5 - compute one dqds transform in ping-pong form, one
version for IEEE machines another for non IEEE machines
SYNOPSIS
SUBROUTINE DLASQ5( I0, N0, Z, PP, TAU, DMIN, DMIN1, DMIN2,
DN, DNM1, DNM2, IEEE )
LOGICAL IEEE
INTEGER I0, N0, PP
DOUBLE PRECISION DMIN, DMIN1, DMIN2, DN, DNM1,
DNM2, TAU
DOUBLE PRECISION Z( * )
PURPOSE
DLASQ5 computes one dqds transform in ping-pong form, one
version for IEEE machines another for non IEEE machines.
ARGUMENTS
I0 (input) INTEGER
First index.
N0 (input) INTEGER
Last index.
Z (input) DOUBLE PRECISION array, dimension ( 4*N )
Z holds the qd array. EMIN is stored in Z(4*N0) to
avoid an extra argument.
PP (input) INTEGER
PP=0 for ping, PP=1 for pong.
TAU (input) DOUBLE PRECISION
This is the shift.
DMIN (output) DOUBLE PRECISION
Minimum value of d.
DMIN1 (output) DOUBLE PRECISION Minimum value of d,
excluding D( N0 ).
DMIN2 (output) DOUBLE PRECISION Minimum value of d,
excluding D( N0 ) and D( N0-1 ).
DN (output) DOUBLE PRECISION
d(N0), the last value of d.
DNM1 (output) DOUBLE PRECISION
d(N0-1).
d(N0-2).
IEEE (input) LOGICAL
Flag for IEEE or non IEEE arithmetic.
Man(1) output converted with
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